Where can I buy ride models and how much?

From a shop for alot of money.

Well I can see that you are in Sydney, so if you head on down to HOBBYCO. in Pitt Street mall, they have a wide selection of FALLER ride models. They range in prices from about $100-$400, really does depend on what you want though. Chris

Try Ebay also mate

www.coasterdynamix.com do awesome working coaster sets!

They are a very good coaster company, shame that they don't include a station, and they don't operate very realistic.

With gravity being a constant, you will never get realistic movement in ride models, especially coasters, being so much smaller and lighter, they will move around the track much faster.

That much is true but They are still alot of fun to play with and design different track layouts for. as for a station it wouldnt be that hard to just build your own and they have alot of new accessories coming out shortly so maybe one will come out soon.

I really want to build a model amusement park....hmmm. Maybe I should build a model Wonderland? But thanks!

Been there, doing that. "Australiana Land", the official Construction Thread. http://www.defunction.net/forums/showthread.php?p=641

Do you think that making a model 'Demon' and 'Zodiac' would be possible?

It would be possible with the right materials, but there is nothing like that around as a kit, but it can be possible to build from scratch, with all the raw materials, and you do need to know exactly what you are doing.

Check my model out i am building. HERE